Algarve Sunsets

One evening up in the hills north of Faro. There was a lot of dust or pollution in the air which almost completely blocked the sun even though it was above the horizon. There was just a small, clear band in the last minute before it set. I can't decide which of the first three I like best, so I'd appreciate some feedback. The last one is also nice and shows how the air was clear above this band of dust.